Auto eager loading broken for has_many through associations where the model is an STI subtype

[jturkel]

Example models:

class Group < ActiveRecord::Base
  has_many :users
  has_many :articles, through: :users
end

class User < ActiveRecord::Base
  belongs_to :group
  has_many :articles
end

class Post < ActiveRecord::Base
  belongs_to :user
end

class Article < Post
end

Can't auto eager load (or regular eager load) Group#articles.

Underlying issue is rails/rails#11078. Workaround is to set auto_include = false on these associations

[jturkel]

I've confirmed this is still an issue on Rails master.

[sfcgeorge]

I just tried Goldiloader and immediately had some issue involving the STI type field. However it seems to be fixed in Rails 5.2 (finally) and sure enough upgrading does seem to have fixed my issue :) rails/rails#14312

So, if anyone else experiencing STI issues with Goldiloader could upgrade to Rails 5.2 and confirm that the issue is fixed for them too, then I think this issue could be closed.

[jturkel]

Nice! I've confirmed this is fixed in 5.2.0 via the following gist.